铸造成组一行 [英] Casting into grouping row

问题描述

我不知道为什么我得到以下异常我该怎么投进去分组行？什么组一行意味着

I dont know why i am getting the following exception how can I cast into grouping Row ? What does grouping row means

推荐答案

InvoiceHeaderCollection 是组的集合，该组是一样的东西：

InvoiceHeaderCollection is a collection of groups, the groups is something like:

      Key               Value
 invoice account1      datarow1 //the value is a `DataRow`
                       datarow2
                       datarow4
 invoice account2      datarow3
 invoice account3      datarow5 

所以，我认为你需要：

So I think you need:

foreach(var g in InvoiceHeaderCollection)
{
    DataRow[] rows = g.ToArray();   //to get all the DataRows in the group
    //maybe another loop through the rows
}

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